/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright 1999-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// $Id: JAXPExtensionsProvider.java,v 1.1.2.1 2005/08/01 01:30:17 jeffsuttor Exp $

package com.sun.org.apache.xpath.internal.jaxp;

import javax.xml.transform.TransformerException;
import javax.xml.xpath.XPathFunctionResolver;
import javax.xml.xpath.XPathFunction;
import javax.xml.xpath.XPathFunctionException;

import com.sun.org.apache.xpath.internal.ExtensionsProvider;
import com.sun.org.apache.xpath.internal.XPathContext;
import com.sun.org.apache.xpath.internal.objects.XObject;
import com.sun.org.apache.xpath.internal.objects.XNodeSet;
import com.sun.org.apache.xpath.internal.res.XPATHErrorResources;
import com.sun.org.apache.xalan.internal.res.XSLMessages;
import com.sun.org.apache.xalan.internal.utils.FeatureManager;

import com.sun.org.apache.xpath.internal.functions.FuncExtFunction;
import java.util.Vector;
import java.util.ArrayList;
import javax.xml.namespace.QName;

/**
 * @author Ramesh Mandava ( ramesh.mandava@sun.com )
 */
public class JAXPExtensionsProvider implements ExtensionsProvider {

  private final XPathFunctionResolver resolver;
  private boolean extensionInvocationDisabled = false;

  public JAXPExtensionsProvider(XPathFunctionResolver resolver) {
    this.resolver = resolver;
    this.extensionInvocationDisabled = false;
  }

  public JAXPExtensionsProvider(XPathFunctionResolver resolver,
      boolean featureSecureProcessing, FeatureManager featureManager) {
    this.resolver = resolver;
    if (featureSecureProcessing &&
        !featureManager.isFeatureEnabled(FeatureManager.Feature.ORACLE_ENABLE_EXTENSION_FUNCTION)) {
      this.extensionInvocationDisabled = true;
    }
  }

  /**
   * Is the extension function available?
   */

  public boolean functionAvailable(String ns, String funcName)
      throws javax.xml.transform.TransformerException {
    try {
      if (funcName == null) {
        String fmsg = XSLMessages.createXPATHMessage(
            XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,
            new Object[]{"Function Name"});
        throw new NullPointerException(fmsg);
      }
      //Find the XPathFunction corresponding to namespace and funcName
      javax.xml.namespace.QName myQName = new QName(ns, funcName);
      javax.xml.xpath.XPathFunction xpathFunction =
          resolver.resolveFunction(myQName, 0);
      if (xpathFunction == null) {
        return false;
      }
      return true;
    } catch (Exception e) {
      return false;
    }


  }


  /**
   * Is the extension element available?
   */
  public boolean elementAvailable(String ns, String elemName)
      throws javax.xml.transform.TransformerException {
    return false;
  }

  /**
   * Execute the extension function.
   */
  public Object extFunction(String ns, String funcName, Vector argVec,
      Object methodKey) throws javax.xml.transform.TransformerException {
    try {

      if (funcName == null) {
        String fmsg = XSLMessages.createXPATHMessage(
            XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,
            new Object[]{"Function Name"});
        throw new NullPointerException(fmsg);
      }
      //Find the XPathFunction corresponding to namespace and funcName
      javax.xml.namespace.QName myQName = new QName(ns, funcName);

      // JAXP 1.3 spec says When XMLConstants.FEATURE_SECURE_PROCESSING
      // feature is set then invocation of extension functions need to
      // throw XPathFunctionException
      if (extensionInvocationDisabled) {
        String fmsg = XSLMessages.createXPATHMessage(
            XPATHErrorResources.ER_EXTENSION_FUNCTION_CANNOT_BE_INVOKED,
            new Object[]{myQName.toString()});
        throw new XPathFunctionException(fmsg);
      }

      // Assuming user is passing all the needed parameters ( including
      // default values )
      int arity = argVec.size();

      javax.xml.xpath.XPathFunction xpathFunction =
          resolver.resolveFunction(myQName, arity);

      // not using methodKey
      ArrayList argList = new ArrayList(arity);
      for (int i = 0; i < arity; i++) {
        Object argument = argVec.elementAt(i);
        // XNodeSet object() returns NodeVector and not NodeList
        // Explicitly getting NodeList by using nodelist()
        if (argument instanceof XNodeSet) {
          argList.add(i, ((XNodeSet) argument).nodelist());
        } else if (argument instanceof XObject) {
          Object passedArgument = ((XObject) argument).object();
          argList.add(i, passedArgument);
        } else {
          argList.add(i, argument);
        }
      }

      return (xpathFunction.evaluate(argList));
    } catch (XPathFunctionException xfe) {
      // If we get XPathFunctionException then we want to terminate
      // further execution by throwing WrappedRuntimeException
      throw new com.sun.org.apache.xml.internal.utils.WrappedRuntimeException(xfe);
    } catch (Exception e) {
      throw new javax.xml.transform.TransformerException(e);
    }

  }

  /**
   * Execute the extension function.
   */
  public Object extFunction(FuncExtFunction extFunction,
      Vector argVec)
      throws javax.xml.transform.TransformerException {
    try {
      String namespace = extFunction.getNamespace();
      String functionName = extFunction.getFunctionName();
      int arity = extFunction.getArgCount();
      javax.xml.namespace.QName myQName =
          new javax.xml.namespace.QName(namespace, functionName);

      // JAXP 1.3 spec says  When XMLConstants.FEATURE_SECURE_PROCESSING
      // feature is set then invocation of extension functions need to
      // throw XPathFunctionException
      if (extensionInvocationDisabled) {
        String fmsg = XSLMessages.createXPATHMessage(
            XPATHErrorResources.ER_EXTENSION_FUNCTION_CANNOT_BE_INVOKED,
            new Object[]{myQName.toString()});
        throw new XPathFunctionException(fmsg);
      }

      XPathFunction xpathFunction =
          resolver.resolveFunction(myQName, arity);

      ArrayList argList = new ArrayList(arity);
      for (int i = 0; i < arity; i++) {
        Object argument = argVec.elementAt(i);
        // XNodeSet object() returns NodeVector and not NodeList
        // Explicitly getting NodeList by using nodelist()
        if (argument instanceof XNodeSet) {
          argList.add(i, ((XNodeSet) argument).nodelist());
        } else if (argument instanceof XObject) {
          Object passedArgument = ((XObject) argument).object();
          argList.add(i, passedArgument);
        } else {
          argList.add(i, argument);
        }
      }

      return (xpathFunction.evaluate(argList));

    } catch (XPathFunctionException xfe) {
      // If we get XPathFunctionException then we want to terminate
      // further execution by throwing WrappedRuntimeException
      throw new com.sun.org.apache.xml.internal.utils.WrappedRuntimeException(xfe);
    } catch (Exception e) {
      throw new javax.xml.transform.TransformerException(e);
    }
  }

}
